| Classic Cleaners Leeds Ltd | Other services | 2023 |
| Classic Cleaners Unit Ltd | Other services | 2025 |
| Classic Craze Bakery Ltd | Wholesale & retail | 2025 |
| Classic Decor Ltd | Construction | 2024 |
| Classic English Fisheries Limited | Hospitality | 2026 |
| Classic Rowan Ltd | Financial services | 2022 |
| Classic Sign and Design Limited | Manufacturing | 2002 |
| Classic Time Machines Ltd | Wholesale & retail | 2016 |
| Classical Baths Ltd | Wholesale & retail | 2023 |
| Classis Partnership Limited | Professional & scientific | 2023 |
| Clattergate Limited | Construction | 2017 |
| CLAUS88 Ltd | Transport & logistics | 2021 |
| Clave Clean Ltd | Administrative & support | 2025 |
| Clave Holdings Ltd | Information & communication | 2025 |
| Claws by Chloe Ltd | Other services | 2025 |
| Clawson Commercial Properties Ltd | Real estate | 2026 |
| Clawson Properties Ltd | Real estate | 2023 |
| Clay & Co Accountancy Limited | Professional & scientific | 2025 |
| Claydrum Engineering Services Limited | | 1980 |
| Clayforth Gardening Services Ltd | Professional & scientific | 2024 |
| Clayton Cleaning Services Ltd. | Other services | 2021 |
| Clayton Holmes Naisbitt Financial Administration LLP | | 2013 |
| Clayton Holmes Naisbitt Financial Consultancy LLP | | 2008 |
| Clayton Holmes Naisbitt Limited | Financial services | 2006 |
| Clayton Homes Ltd | Real estate | 2023 |
| Clayton Resourcing Solutions Ltd | Administrative & support | 2023 |
| Clayton Wood Close Management Limited | Real estate | 2000 |
| Claywood Construction Limited | Construction | 2019 |
| CLC and PKM Limited | Hospitality | 2016 |
| CLC Property Management Ltd | Real estate | 2016 |
| Cleaba Care Limited | Health & social care | 2015 |
| Clean Air Technology International Limited | Wholesale & retail | 2019 |
| Clean Aura Collective Ltd | Administrative & support | 2025 |
| Clean Break Consultants Ltd | Other services | 2025 |
| Clean Deep FM Limited | Administrative & support | 2026 |
| Clean Deep Ltd | Administrative & support | 2018 |
| Clean Energy & AI Research (Cleair) Ltd | Information & communication | 2025 |
| Clean Evolution Chain Ltd | Construction | 2024 |
| Clean Flow Water Limited | Water & waste | 2010 |
| Clean Heart Consulting Ltd | Professional & scientific | 2022 |
| Clean Kitchen Limited | Hospitality | 2015 |
| Clean Leeds Limited | Administrative & support | 2023 |
| Clean Sciences Limited | Manufacturing | 2012 |
| Clean Tech Plus Limited | Other services | 2018 |
| Clean UP Leeds Ltd | Administrative & support | 2025 |
| Clean&Colect and Shine Ltd | Transport & logistics | 2021 |
| Clean-Desk Software Consultancy Limited | Information & communication | 2018 |
| CLEAN4U Solutions (UK) Ltd | Administrative & support | 2025 |
| Cleanandrest Ltd | Administrative & support | 2025 |
| Cleancents Ltd | Information & communication | 2025 |
| Cleaning ADE 2026 Ltd | Transport & logistics | 2026 |
| Cleaning Emmar Ltd | Administrative & support | 2025 |
| Cleaning ETC Ltd | Administrative & support | 2013 |
| Cleaning Expert Solutions Ltd | Administrative & support | 2023 |
| Cleaning Great Services Ltd | Administrative & support | 2025 |
| Cleaning Investment Ltd | Administrative & support | 2024 |
| Cleaning Machine Support Ltd | Other services | 2016 |
| Cleaning Means ALL Ltd | Construction | 2020 |
| Cleaning Services Leeds Ltd | Administrative & support | 2024 |
| Cleaning Stars Ltd | Administrative & support | 2018 |
| CLEANING4U Leeds Ltd | Administrative & support | 2024 |
| Cleansort Ltd | Administrative & support | 2020 |
| Cleanway Logistics Ltd | Transport & logistics | 2025 |
| Cleanways Apex Group Limited | Wholesale & retail | 2026 |
| Clear Bricks Limited | Real estate | 2021 |
| Clear Choice Appliances Ltd | Wholesale & retail | 2024 |
| Clear Clean Solutions Ltd | Administrative & support | 2025 |
| Clear Complexity Limited | Information & communication | 2010 |
| Clear Compliance Limited | Professional & scientific | 2011 |
| Clear Counting Ltd | Professional & scientific | 2022 |
| Clear Engineering Solutions Ltd | Professional & scientific | 2017 |
| Clear Home Specialist Cleaning Ltd | Administrative & support | 2026 |
| Clear Horizons Cleaning Services Limited | Administrative & support | 2018 |
| Clear Shine Limited | Other services | 2024 |
| Clear Tech Trading Limited | Wholesale & retail | 2026 |
| Clear View Cleaning Services Ltd | Administrative & support | 2025 |
| Clear Vision (Leeds) Ltd | Administrative & support | 2023 |
| Clear-Flow Limited | Water & waste | 2002 |
| Clearance Brands Limited | Wholesale & retail | 2011 |
| Clearance Depot Leeds Limited | Wholesale & retail | 2024 |
| Clearance Hub Ltd | Wholesale & retail | 2023 |
| Clearance Stock Global Ltd | Wholesale & retail | 2017 |
| Clearcare Properties Ltd | Administrative & support | 2026 |
| Clearchoice Ltd | Administrative & support | 2011 |
| Cleardeepai Ltd | Information & communication | 2026 |
| Clearer Skies UK Ltd | Professional & scientific | 2026 |
| Clearlink Recruitment Solutions Limited | Administrative & support | 2014 |
| Clearmedicalsupply Ltd | Wholesale & retail | 2025 |
| Clearpurus Ltd | Professional & scientific | 2025 |
| Clearsilver Brand Marketing Limited | Professional & scientific | 2013 |
| Clearsip Ltd | Wholesale & retail | 2023 |
| Clearsound Acoustics Limited | Construction | 2022 |
| Clearspaceuk Ltd | Transport & logistics | 2023 |
| Cleartrade Ltd | Information & communication | 2025 |
| Clearview Health Solutions Ltd | Health & social care | 2025 |
| Clearwater Hills Projects Ltd | Professional & scientific | 2023 |
| Clearwater Shipping Line Ltd | Extraterritorial | 2015 |
| Cleck Furnishing Outlet Ltd | Wholesale & retail | 2019 |
| Cleckheaton Car & Commercial Ltd | Wholesale & retail | 2016 |
| Cleckheaton Mobile Tyres Ltd | Wholesale & retail | 2025 |